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Let compiler assume, that Layout::align() is always a power of two #75281

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Let compiler assume, that Layout::align() is always a power of two #75281

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10 changes: 9 additions & 1 deletion library/core/src/alloc/layout.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -107,7 +107,15 @@ impl Layout {
#[rustc_const_unstable(feature = "const_alloc_layout", issue = "67521")]
#[inline]
pub const fn align(&self) -> usize {
self.align_.get()
let align = self.align_.get();
if !align.is_power_of_two() {
debug_assert!(false, "alignment is not a power of two");
// SAFETY: align is guaranteed to be a power of two
unsafe {
crate::hint::unreachable_unchecked();
}
}
align
}

/// Constructs a `Layout` suitable for holding a value of type `T`.
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